Safety-valve abtd pressuee-gage



rra sfrafas 1 o rios..

l JAMES H. VINN. OF PORTAGE, XVISCONSIN.

SAFETY-VALVE AND ERESSURE-GAGE.

shaft has secured to it a grooved sector I,

weights H, H, opposite to the center thereof 'i Specca-tion of Letters Patent No. 21,390, dated August 31, 1858.

T all whom t may concern: Y which may be considered as a more con- Be it known that I, JAMES H. VINN, of venient substitute for a pulley and 'which is Portage, in the county of Columbia and connected by a chain e, with the head of State of IVisconsin, have invented a new the piston rod D. The upper portion of the 5 and Improved Apparatus constituting a piston rod is slotted for the sector I to work 50 Combined Safety-Valve and Steam-Pressure within it, which arrangement permits the Gage; and I do hereby declare that the folrod to get a more direct pull upon the chain lowing is a full, clear, and exact description and vice versa, than if the latter were conof the same, reference being had to the acnected with one side of it.

l0 companying drawings, making part of this L, is the index, which is hung loosely on 65 specification, in whicha pin f, which attaches it to one side of one Figure l is a front view of the apparatus, of the weights H, H; the axis of said pin and Fig. 2 is a central section of the same in being parallel with the axis of the shaft E, a plane at right angles to Fig. 1. and opposite the center of the weight. This Similar letters of reference indicate like index is weighted in such a manner as to 70 parts in both figures. keep it always in an upright position not- This invention consists in a novel and very withstanding the oscillation of the weight H,

simple method of applying and arranging to which it is attached.

one or more weighted pendulous rods and M, is the dial plate attached by a rigid an index and dial, in combination with a arm N, to the standard F, and graduated in 75 piston valve and suitable arrangement of vertical lines and arranged so that the index steam passages, whereby the escape of moves nearly in contact with its face as the steam from a boiler as soon as it arrives at weight H, to which it is attached, oscillates. any desired pressure is provided for and any The operation of the apparatus is as folpressure of steam below that at which it is lows VVhen there is no pressure of steam 80 desired te escape. is Correctly indicated by in the boiler the weights H, H, keep the two the index on the dial.` rods G, G, which are arranged parallel with To enable others to make and use my ineach other to a vertical position, and the vention, I will proceed to describe its conpiston is held by the act-ion of the weights struction and operation. on the rods and shaft, below the orifices Z), b, 85

A, is an upright cylinder having an open in the cylinder A; but as steam is generated, bottom and having its upper part surroundits pressure acting upon the piston forces ed by an annular chamber an, which comthe latter upward in the cylinder until the municates with its interior by several openrods G, G, have been moved to such a posiings 19,6, and from which there branches ofil tion by the action of the piston rod and 90 a pipe B. This cylinder is intended to be chain upon the sector I, that their weights secured on the, top of the boiler, over a suitact upon them with sufiicient effect to balable opening. ance the pressure of the steam, and so long C, is the piston, which constitutes the as the said pressure remains uniform the safety valve, fitted to work steam tight piston and all other parts of the apparatus 95 within the cylinder A, and having attached remain stationary, and the index L, indito it a rod D, which works through a guide cates the pressure on the dial. The effectual c, at the top of the cylinder. length of the rods G, G, and the length of E, is a horizontal shaft which is fitted to the chain e, are so adjusted that the rods work in bearings in a standard F, erected on G, G, arrive at a horizontal position, when 100 top of cylinder A, and occupies a position the pressure reaches the highest degree deat a little dista-nce from one side of and besired and that when they arrive at that posilow the top of the piston rod. This shaft tion the lower edges of the pist-on pass the has at each end an internally screwed eye (Z, lower edges of the orifices b, Z), and permit into which screws one of two pendulous rods the escape of steam from the cylinder below 105 G, G, to the extremities of which are secured the piston through said orifices into the anequal weights H, H, which are both to be at nular chamber a., from whence it passes to the same distance from the center of the the escape pipe B.

w shaft E, and opposite the piston rod D, said The index L being attached to one of the u Will give the saine indication on the dial IVI, for the same pressure of steam as far as it is capable of moving, Whatever may be the distance of the Weights from the center of the shaft E, and this enables the Weights or the effective length of their rods G, G, to be adjusted to permit the escape of the steam at various pressures. This adjustment is effected by raising the rods G, G, to the horizontal position, that being the position they occupy When the piston is above the lower edges of the escape orifices of the cylinder A; and then screwing the rod G of the Weight to which the index is attached through its eye d, till the index, hanging in a vertical position on its pin f, is opposite the mark on the dial indicatino the desired pressure, and afterwardadjusting the other JAMES H. VVINN.

Witnesses:

GEO. B. BURCH, JosmH ARNOLD. 

